Blowpipe



A. E. KING.

BLOWPIPE.

APPLICATION man NOV-17,1920.

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Applicatiqn filed November To all whom it may concern.

Be it known that I, ALBERT l lune, a citizen of Canada, residing atlios Angeles, in.

' ticles where heating, soldering, brazing,

welding, and similar operations are employed.

An object of this invention is to provide a means whereby a flame of different degrees of heat ranging from that of a minute hydrogen gas flame to an intense oxy-hydrogen flame may be readily produced by a single instrument, and the flames of various temperatures gradually increased or diminished where occasion requires.

Another object is to provide a torch or blow-pipe adapted to form a flame of any desired combustible gas and an air jet where a flame of lower temperatures is desired, and to form a dame of the gas and oxygen where a flame of higher temperatures is required.

A further object is to provide a simple and effective valve actuating mechanism whereby the operator of the torch may readily con trol the flame and vary its temperature with. the hand employed in holding, the torch and directing the flame so that theother hand may be free to manipulate the article worked upon or otherwise used to facilitate the work.

@ther objects will appear hereinafter.

The invention is illustrated in the accom Figure 6 is a view in cross section as seen on the line 6-6 of Figure 1.

More specifically, 7 indicates a valve casing which houses a tapered rotary valve 8, and is formed with a series of three separate superimposed passages a, Z), and c intersected Specification of letterwetent Patented June an, 1922,

17, 1920. .ficrial. No. 241375.

by the valve. A nozzle 9 projects from the valve casing and comprises a serieso'f three concentric tubes 10, 11, and 12. The innermost tube 10 forms a duct al which leads from the passage a, the intermediate tube 11 forms a duct 6 which leads from the passage 1;, and the outer tube 12 forms a duct f which leads from the passage 0. The tubes 10, 11,

and 12 terminate at the outer end ot the nozzle in tips 18, 14, and 15 respectively; the tip 13 opening just within the open end of the tip 14, and the latter opening just within the open end of the outer tip 15. The outer end of the nozzle is bent downwardly, and the outer tip 15 is formed with an upwardly extending elongated sight member 16 to facilitate aiming the nozzle and pointing the tip at a certain point.

Connecting with the passages a, l), and 0 are conduits 17, 18, and 19 which are attached to flexible hose 20, 21 and 22 leading from suitable sources of supply of oxygen, air and hydrogen gas respectively. 7

' The valve 8 normally closes the passages a, l), and 0 to prevent the flow of the oxygen, air and hydrogen to the nozzle, and is provided with a series of ports whereby when the valve is turned to one position hydrogen and air will be permitted to flow into the outer tube 15 and the intermediate tube 14 and when turned to another position hydrogen and oxygenwill be delivered to the intermediate tube 14 and the inner tube 13 respectively, while the passage 2) is closed to the air. To accomplish the purpose just stated the valve 8 is formed with a pair of parallel superimposed ports 9 and it adaptedto register with the passages and 0 respectively and to open and close these passages simultaneously, and is formed with a second pair of vertically spaced ports 2' and j arranged on a plane extending at an angle to the vertical plane of the ports g and h. The uppermost port 71 is adapted to open the passage a and the port j is adapted to open communication between the passage 0 and the passage 6 after the ports 9 and it have opened and closed the passages 79 and c; the ports 2' and coincidently opening and closing on rotation of the valve 8.

Means are provided whereby the valve may be turned to its various positions and controlled by the fingers of the hand in which the torch is held, which is here shown as embodying a slide bar 23 mounted in. a

guide-way 24 formed in an extension 25 on the valve casing; the slide bar being fitted with a finger hold 26 by which it may be retracted in opposition to a spring 27. Carried on the slide bar is a rearwardly extending stem 28 having a series of pins 29 thereon adapted to en age notches 30 in a flange 31 formed on the lower end of the valve in such manner than when the slide bar is advanced or retracted the valve will be caused to rotate.

As a means for holding the slide bar in various positions in opposition to the spring 27 a ratchet bar 32 is mounted on the slide bar and extends along the side of the valve casing and is adapted to be engaged by a bill 33 formed on the outer end of the arm 34 of a trip lever pivoted at 35 on the side 1 of the valve casing and acted on by a spring 36 by which the bill is normally maintained in position to engage the teeth of the ratchet bar. The trip lever is provided with a downwardly extending portion 37 fitted with a push button 38 at its lower end by which the lever may be rocked on its pivot to disengage the bill from the'ratchet bar. The valve casing and the conduits are encased in a shell 39 formed in the shape of a revolver stock and providing a hand-hold 40 by'which the torch may be readily grasped in the hand and held with a finger engaged with the finger piece 26 in such manner that the slide bar may be easily drawn back by pulling on the finger piece much in the same manner as in pulling the trigger of a revolver. 1 he button 38 is disposed on the inner side of the hand-hold where it may be easily depressed by the third or fourth fingers of the hand grasping the stock.

In the operation of the invention, the valve is normally disposed to close the passages a, b, and c, in which position the slide bar and finger piece will be in their outermost positions, as shown in Figures 1 and 2.

When it is desired to produce a flame of hydrogen gas and air the slide bar is drawn back sufliciently to open the ports 1 and h to the passages b and c, as shown in Figure 4, and permit gas and air to flow through the ducts f and e and be discharged from the nozzle tips 15 and 14 respectively where on being ignited a flame of comparatively low temperature will be formed and the intensity of which may be regulated by varying the extent of opening of the ports 9 and h.

The bill engaging the ratchet bar' will act to hold the valve in its advanced position, the teeth on the ratchet bar being sufficiently close together to permit the valve being advanced step by step with slight movement so that the ports may be opened little by little and thus permit gradual increase in the in tensity ofthe flame.

When it is desired to produce a flame of greater intensity than that of the burning hydrogen and air the slide bar is advanced to continue rotation of the valve to close ports 9 and h to passages 12 and c and open ports z and y so as to direct the hydrogen gas from the passage 0 to the passage 6 into the duct 6 and out through the nozzle 14 and at the same time open port i to the passage a to direct oxygen to the duct d and out the nozzle tip 13, thus forming a mixture of oxygen and hydrogen at the nozzle tip which on being ignited will form an intense flame, the degree of which may be gradually increased by opening ports 2' and j step by step as before described until the ports are fully opened.

When it is desired to turn the valve in retrograde movement the trip lever is disengaged from the ratchet bar by depressing the push button 38, whereupon the spring 27 will act to advance the slide bar 23 on releasing the finger hold 26. Byholding the trip lever out of engagement with the ratchet bar, the slide bar may be moved in either direction underthe action of the finger and spring so that regulation of the flame may be readily effected.

The volume of the hydrogen, air, and oxygen delivered to the torch may be regulated, of course, by usual control valves, not necessary to be here shown; the control valve of the torch permitting control of the flame and change in the character of the flame by the hand in which the torch is held.

While I have shown and described a specific embodiment of my invention, I do not limit myself to the exact details of construction shown, but may employ such changes in the parts and their arrangementpr their equivalents as come within the scope of the appended claims.

I claim:

1. In a blow pipe, a valve casing having a series of three superimposed passages therein, a rotary valve in said casing adapted to close said passage, said valve being formed with parallel ports adapted to open a pair of the passages and formed with a second pair of ports extending on an angle to the plane of the first named ports adapt- 1 ed to open the other passage and form a communication between the other passages, and a nozzle embodying a series of ducts connecting with said passages.

2. In a blow pipe, a. valve casing having a series of three superimposed passages, therein, a rotary valve in said casing adapted to close said passages, said valve being formed with parallel ports adapted to open a pair of the passages and formed with a second pair of ports extending on an angle to the plane of the first named ports adapted to open the other passage and form a communication between the other passages,

a nozzle embodying a series of ducts con- 30 aaaaiov second pair of ports extendin on an angleto the ane of the first name ports adapted to .open theotherpassage; and form a communication between the other-passages,

a nozzle embodyinga series of ducts connecting witlrsaid passages, spring pressed reciprocal means for turning said valve, and releasable means for holding the valve in various positions.

4. In a blow pipe, a valve casing having a series of three superimposed passages therein, a rotar valve in said casing adapt-' ed to close sai passages, said valve being formed with parallel ports adapted to open a pair of the passages and formed with a second pair of ports extending on an angle to the plane of the first named ports adapted to open the other passages and form a communication between the other passages, a nozzle embodying a series of ducts connecting with said passages, a reciprocal slide bar, a spring actlng on said slide bar to move same in one direcpassages, said valve beingv tion, means whereby movement of said slide bar will efiect rotation of the valve, and means for holding said slide bar in various positions in opposition to said spring.

5. In a blow pipe, a nozzle comprising an outer'duct, an inner duct, and an intermediate duct; a valve casing on which said nozzle is mounted, means for delivering a combustible gas,air, and oxygen separately to said valve casing, and a valve in said casing adapted to direct gas and air to the outer and intermediate ducts respectively or direct the gas and oxygen to the intermediate and inner ducts respectively.

6. In a blow pipe, a valve casing, a valve therein,,a nozzle projecting from said valve casing, a hand-hold encompassing said valve casing, a slide bar, a finger piece on said slide bar adapted to be engaged by the finger of the hand grasping the hand-hold, a spring for yieldably opposing movement of the slide bar in one direction and for moving it in the opposite directiommeans Whereby movement of said slide bar will effect movement of the valve, a trip lever for holding the slide bar in various positions in opposition to said spring, and means operable by the hand grasping the hand-hold for releasing said trip lever to permit movement of the slide bar under action or" said spring.

ALBERT E. KING. 

